Definition of: valley

(val′ē) noun
1. A depression of the earth's surface, as one through which a stream flows; level or low land between mountains, hills, or high lands; also, the people who inhabit a valley.
2. Archit. a The gutter or angle formed by the meeting of the two roof slopes. b An interval in a vault, or the space between vault ridges as seen from above.
3. A vallecula. [<OF valee <val <L vallis a valley] Synonyms: canyon, dale, dell, dingle, glen, gorge, gulch, gully, ravine, vale.